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cpalmer54 · 2024-11-01

Hi,I seem to behaving an issue getting my STM32F411 PLL to stabilize using the HSI. The code I am using shown below. Setting it to 100MHZ. The code gets stuck in RCC_GetSYSCLKSource() != 0x08 ) continue; . It never returns 8. I had originally got ...

cpalmer54 · 2024-11-03

That has done the trick. I'm very grateful for the help. Thanks for taking the time to reply.

cpalmer54 · 2024-11-03

Thanks JW, I'm going to try this later.

cpalmer54 · 2024-11-03

Hi,Thanks for the reply. I dont tend to use Cube. I'm a bit old school.

cpalmer54 · 2024-11-03

Thanks you. I think it would have taken me a long time to consider looking at this. I will look into it and report back. Schematic snippet enclosed. I have 2.2uF caps on the VCAP pins.

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STM32F411 cant get PLL to stabilize using HSI

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